I feel the need to preface this post by saying that if you ask your friendly store worker they will more than likely give you paint samples. If they don't just go to another store and ask. There. Now that I've added the "please don't steal paint chips" disclaimer we can move on to the post. :)
I know this isn't in English. But know worries as a picture is truly worth a 1000 words.
As soon as I saw this I thought, "what a way cool way to let kids practice measurement skills in a real life way." With the Common Core Math Standards being so measurement heavy I can see you getting lots of mileage out of this idea.
I would encourage kids to do this as an indoor recess choice as well.
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